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#1
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I have a 97 Saturn with a Delco 12-CD changer. The pinout is like
this: 1 brown / white Left Audio Out 2 dark green / white Right Audio Out 3 black / white Audio Common 4 bare Ground / Shield 5 orange Power 6 7 black Ground 8 9 10 dark green e/c data line I understand that I can substitute the audio from the mp3 player by splicing into the audio lines from the CD player. Obviously, I want to be able to switch between the two sources (the trunk CD player and the MP3 player). I noticed that the output from both the CD player and the MP3 player uses THREE lines (left, right, and common). Does that mean I need a tripole/dual throw (TPDT) switch? Or can I just ignore the common line? Is there a signal on the common line or is it just a reference voltage? I was going to try a DPDT switch as shown below, but when I tried hooking up some headphones to just the two outputs (left and right), and it sure sounded funny. It sounded fine when I hooked up the common line as well, leading me to believe I needed all three. Excuse the crude drawing :-/ __________ CD player Left ----------|--x | CD player right ----------|-------X | | | | | output left---------------|--x | output right -------------|-------x | | | | | MP3 player left ---------|--x | MP3 player right ---------|-------x | ----------- |
#2
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The DPDT switch (or relay!) will work fine. Just connect the 'audio common'
wires together without a switch... Ex: MP3 common to CD common to Radio common, MP3 L to switch (or relay) NO contact, CD L to NC contact, and radio L to COM contact, MP3 R to switch (or relay) NO contact, CD R to NC contact, and radio R to COM contact. If you need a diagram or more info, please post a request at www.UnderTheDash.com/board Hope the info helps, David UnderTheDash.com "Robert Jacobson" wrote in message m... I have a 97 Saturn with a Delco 12-CD changer. The pinout is like this: 1 brown / white Left Audio Out 2 dark green / white Right Audio Out 3 black / white Audio Common 4 bare Ground / Shield 5 orange Power 6 7 black Ground 8 9 10 dark green e/c data line I understand that I can substitute the audio from the mp3 player by splicing into the audio lines from the CD player. Obviously, I want to be able to switch between the two sources (the trunk CD player and the MP3 player). I noticed that the output from both the CD player and the MP3 player uses THREE lines (left, right, and common). Does that mean I need a tripole/dual throw (TPDT) switch? Or can I just ignore the common line? Is there a signal on the common line or is it just a reference voltage? I was going to try a DPDT switch as shown below, but when I tried hooking up some headphones to just the two outputs (left and right), and it sure sounded funny. It sounded fine when I hooked up the common line as well, leading me to believe I needed all three. Excuse the crude drawing :-/ __________ CD player Left ----------|--x | CD player right ----------|-------X | | | | | output left---------------|--x | output right -------------|-------x | | | | | MP3 player left ---------|--x | MP3 player right ---------|-------x | ----------- |
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